I couldn't tell you
idiom
: I don't know
"Do you know where the library is?" "I'm sorry. I couldn't tell you."
Cite this Entry
“I couldn't tell you.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/I%20couldn%27t%20tell%20you. Accessed 31 Oct. 2025.
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Merriam-Webster unabridged
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